Comprehensive washing remediation method and system for heavy metal contaminated soil

A technology of contaminated soil and remediation method, which is applied in the field of comprehensive leaching and remediation method and system of heavy metal contaminated soil, which can solve the problems of high cost of chemicals, improper treatment, secondary pollution, etc., and achieve avoidance of secondary pollution, low cost, and improved The effect of adsorption rate

Active Publication Date: 2016-12-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a method and syst

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  • Comprehensive washing remediation method and system for heavy metal contaminated soil
  • Comprehensive washing remediation method and system for heavy metal contaminated soil
  • Comprehensive washing remediation method and system for heavy metal contaminated soil

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[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] figure 1 It is a schematic diagram of the process involved in a method for comprehensive leaching and remediation of heavy metal contaminated soil according to an embodiment of the present invention, such as figure 1 As shown, the comprehensive leaching and repairing system for heavy metal contaminated soil includes a sedimentation subsystem, a heavy metal adsorption subsystem, and a storage tank ...

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Abstract

The invention discloses a comprehensive washing remediation method for heavy metal contaminated soil. The comprehensive washing remediation method comprises the following steps: ploughing and smashing soil, applying acid and alkaline washing agent solid materials, then drawing water when ploughing, washing and dissolving heavy metal out of the soil, and transferring the heavy metal into washing water; guiding the washing water into a sedimentation tank, adding a coagulant, and removing the heavy metal in the washing water through coagulation and sedimentation; draining the washing water into a microorganism and biochar purifying tank, utilizing biochar bags to absorb the heavy metal, and at the same time, enriching the heavy metal through microorganisms on biochar surfaces; and collecting used biochar bags, adding a dilute acid solution into the biochar bags, stirring, and separating the heavy metal absorbed to the biochar surfaces. The invention further discloses a corresponding comprehensive washing remediation system. The technical scheme of the invention greatly increases the absorption rate of the heavy metal, avoids heavy metal secondary pollution, is simple in technical process, is high in automation degree and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation for environmental protection, and more specifically relates to a method and system for comprehensive leaching and remediation of heavy metal-contaminated soil. Background technique [0002] In recent years, with the massive development and utilization of mineral resources, the rapid development of industrial production and the widespread use of various chemical products, pesticides and fertilizers, the problem of soil environmental safety in my country has become increasingly prominent. Heavy metals enter the soil through sewage irrigation, atmospheric soot deposition, and landfill disposal. Heavy metals are difficult to degrade, easy to accumulate, and highly toxic, which affect the growth, yield and quality of crops, and can be absorbed by crops into the food chain, thereby affecting human health. [0003] According to statistics, 12 million tons of grain are polluted by heav...

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08B09C2101/00
Inventor 陈静李鸿博王琳玲石瑶陆晓华彭红潘红王洪
Owner HUAZHONG UNIV OF SCI & TECH
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